I'm not positive, but I think the 400's eventually went to the 3 bolt flange also. Must have still been 2 bolt in '76, unless they are earlier manifolds. For instance, if that motor was in an older car and they used the older car's manifolds. As for the AC bracket, I don't know about that one. Ol' Pinion Head on here seems to be the bracket and pulley expert. Might have to PM him.
__________________
|